1. -2х(1-х)+(2х-3)(х-1) 2. 4(1+3х)^2-24х 3. (х+4)(х-4)-(х-3)^2 4. у-100у^3 5. 7а^-14ab+7b...

Question

1. -2х(1-х)+(2х-3)(х-1)
2. 4(1+3х)^2-24х
3. (х+4)(х-4)-(х-3)^2
4. у-100у^3
5. 7а^-14ab+7b
6. 16-у^4

Answer 1

1.
=-2х+2х^2+2х^2-2х-3х+3=4х^2-7х+3
2.
=4(1+6х+9х^2)-24х=4+24х+36х^2-24х=
=4+36х^2
3.
=х^2-16-х^2+6х-9=6х-25
4.
=у(1-100у^2)=у(1-10у)(1+10у)
5.
=(7а^2-7аб)-(7аб-7б^2)=7а(а-б)-7б(а-б)=
=(а-б)(7а-7б)=7(а-б)^2
6.
=(4-у^2)(4+у^2)=(2-у)(2+у)(4+у^2)